Switch analysis_server to use 'package:test'.

pkg/analysis_server/test/analysis/notification_overrides_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library test.analysis.notification.overrides;
 
 import 'dart:async';
 
 import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:analysis_server/src/constants.dart';
+import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
-import 'package:unittest/unittest.dart';
 
 import '../analysis_abstract.dart';
 import '../utils.dart';
 
 main() {
   initializeTestEnvironment();
-  defineReflectiveTests(AnalysisNotificationOverridesTest);
+  defineReflectiveSuite(() {
+    defineReflectiveTests(AnalysisNotificationOverridesTest);
+  });
 }
 
 @reflectiveTest
 class AnalysisNotificationOverridesTest extends AbstractAnalysisTest {
   List<Override> overridesList;
   Override override;
 
   /**
    * Asserts that there is an overridden interface [OverriddenMember] at the
    * offset of [search] in [override].
@@ skipping 538 matching lines @@
 class B extends A {
   set fff(x) {} // in B
 }
 ''');
     await prepareOverrides();
     assertHasOverride('fff(x) {} // in B');
     assertHasSuperElement('fff(x) {} // in A');
     assertNoInterfaceMembers();
   }
 }